package com.sky.service.impl;

import com.sky.annotation.AutoFill;
import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import com.sky.service.ShoppingCartService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
@Slf4j
public class ShopCartServiceImpl implements ShoppingCartService {

    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private SetmealMapper setmealMapper;
    @Override
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
            //创建shopCart对象
        ShoppingCart shoppingCart = new ShoppingCart();
        //属性赋值
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //查询用户ID,用Threadlocal获取当前的用户
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //查询当前商品是否在购物车里
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);

        //判断语句
        if( shoppingCartList != null && shoppingCartList.size() == 1){
            //如果已经存在，就更新数据，数量加一
            //获取查询数据的第一条数据
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() + 1 );
            shoppingCartMapper.updateNumberById(shoppingCart);
        }else {

            //如果不存在，插入数据，数量就是一
            //判断是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if(dishId != null){
                //添加到购物车的就是菜品
                Dish dish = dishMapper.getById(dishId);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            }
            else {
                //添加到购物车的就是餐车
                Setmeal setmeal = setmealMapper.getById(shoppingCartDTO.getSetmealId());

                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);

        }


    }

    /**
     * 查看购物车
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        return shoppingCartMapper.list(ShoppingCart.
                builder().
                userId(BaseContext.getCurrentId()).
                build());
    }

    /**
     * 清空购物车商品
     */
    public void cleanShoppingCart() {
        shoppingCartMapper.deleteByUserId(BaseContext.getCurrentId());
    }

    /**
     * 删除购物车的一个数据
     * @param shoppingCartDTO
     */
    @Override
    public void deleteShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        //创建shopCart对象
        ShoppingCart shoppingCart = new ShoppingCart();
        //属性赋值
        BeanUtils.copyProperties(shoppingCartDTO,shoppingCart);
        //查询用户ID,用Threadlocal获取当前的用户
        shoppingCart.setUserId(BaseContext.getCurrentId());
        //查询当前商品是否在购物车里
        List<ShoppingCart> list = shoppingCartMapper.list(shoppingCart);
        if(list != null && list.size() > 0){
            shoppingCart = list.get(0);

            Integer number = shoppingCart.getNumber();
            if(number == 1){
                //当前商品在购物车中的份数为1，直接删除当前记录
                shoppingCartMapper.deleteById(shoppingCart.getId());
            }else {
                //当前商品在购物车中的份数不为1，修改份数即可
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateNumberById(shoppingCart);
            }
        }
    }
}
